Same problem today on Duo2, despite the fact it was still at .003: it performed the update to .004, then I tried again to update and it gave the same error (by telnet, of course):
Not selecting libavformat58 4.1.4 as installing it would break existing dependencies.
Not selecting libavdevice58 4.1.4 as installing it would break existing dependencies.
Not selecting libavutil56 4.1.4 as installing it would break existing dependencies.
Not selecting libavcodec58 4.1.4 as installing it would break existing dependencies.
Not selecting libswresample3 4.1.4 as installing it would break existing dependencies.
Not selecting libavresample4 4.1.4 as installing it would break existing dependencies.
Not selecting libswscale5 4.1.4 as installing it would break existing dependencies.
Not selecting libavfilter7 4.1.4 as installing it would break existing dependencies.
Not selecting libpostproc55 4.1.4 as installing it would break existing dependencies.
So, at the moment we know for sure that the problem
AFFECTS Solo4K, Duo2, Uno4KSE, whilst we have different reports for Uno4K (Azam couldn't update, Artorious could);
DOES NOT AFFECT: Ultimo4K, Zero and probably Zero4K (I did not get,
@bogdanm, if you tried again to update after Friday's .004 main update, because this is a new small update of the .004: as I said, the update from 003 to 004 goes well, the next doesn't).